Abstract
Recently, water jet is intensively used in the mechanical engineering and medical application as well. However, the structure and movement of the high speed water jet itself are not clear cut yet.This paper is mainly concerned, by using double exposure holographic interferometry, with the structure and velocity decay of high speed water jet. Experiments were conducted In an Aqua-Jet-Cutter at injection pressure about 230MPa, and with a 0.25mm diameter nozzle. It is found that the water jet velocity is estimated by measuring the angle of the Mach line generated around the jet.
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